Electric sewing machine



May 19, 1931. J. M. NAUL ELECTRIC SEWING MACHINE Filed July 12. 1928 2 Sheets-Sheet l gwwzntoz James M Nag! if .Z

133159, 1931- J. M. NAUL 1,806,489

' ELECTRIC SEWING CHINE Filed July 12, .1928 2 Sheets-Shee 2 1'- j I w V l u? lllllllllllllllllllllll mm" llllllllllllllllllllllllllllllllll| y ggggpngpuynlunulmnuul I W Jnvgntoz James M fVZeul dttoz no Patented May 19, 1931 UNITED STATES PATENT- OFFICE JAMES M. NAUL, OF PL LINI'IELD, NEW JERSEY, ASSIGNOB TO THE SINGER. MANU- FACTURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY ELECTRIC SEWING MACHINE Application filed July 12,

This invention relates to electric sewing machines and has for an object to provide an improved and simplified mechanism for driving and controlling the speed of such 6 machines.

The invention consists in the devices,

. combinations and relative arrangements of parts hereinafter described and claimed. In electric sewing machine outfits it has been'cu'stomary, up to the present time, to

mount the electric motor on the sewing machine gooseneck and connect it by suitable wiring to a motor-controller variously situated in outfits of various types. For example, in the portable type of sewing machine outfit the controller has been mounted in the hollow wooden base of the carrying case. In the drop-head cabinet or library table outfit, the controller has been located below the table-top and within the side walls or skirt-members of the table. With other outfits, foot-operated controllers have been employed; such controllers being placed u on the floor for use and stored in the machine cabinet or can ing case when not in use. These various ispositions of the motor-controller make it necessary for the manufacturer to provide connecting leads of various lengths together with a variety of fittings and accessories for wiring up the variously situated controllers.

With the idea of standardizin and simplifyin the. electrification of t e various types o sewing machines, there is provided, in accordance with the present improvement, a unitary assembly of motor and motor-controller, with the necessary wiring, standardized in one form, which assembly is complete in itself, apart from the sewing machine, and is adapted ;for attachment to or removal from the sewing machine by one not possessed of mechanical or electrical skill.

To avoid the necessity of shifting the motor-into or out of'operativepositlon when the machine is to be used or put away, advantage is preferably taken of the fiat motor disclosed in the U. S. patent to Diehl et al. No. 1,488,234, of March 25, 1924. There is W combined with this motor, a motor-controlshowin plan.

1928. Serial No. 292,186.

ler or rheostat, preferably of the compresconveniently mounted on the motor by providing the motor end-bonnets with upward extensions forming controller-seats to which the controller is secured. Projecting forwardly from the motor is the manual means for operating the controller; such means being preferably in the form of a knee-lever supporting rock-shaft journaled in the motor-supporting bracket and carrying an arm arranged to operate the controller. The bracket carrying the complete assembl may be secured to the usual driving attachment seat, commonly provided on the sewing machine gooseneck, by the application of a single screw.

. The several features of the invention and the advantages attained thereby will be readily understood by thosev skilled in the art from the following description taken in connection with the accompanying drawings which illustrate the several features of the invention as embodied in a portable electric sewing machine.

In the accompanying drawings, Fig. 1 is a front elevation of an electric sewing machine embodying the invention. Fig. 2 is a rear end elevation of the machine. Fig. 3 isa perspective View of the electric motor. Fig. 4 is a horizontal section through the standard of the sewing machine gooseneck, the motor and motor-controller'in ig. 5 is a longitudinal vertical section through the motor and motor'controller. Fig. 6 is a transverse vertical section through thesame, and Fig. 7 is a perspective v1ew of the su porting bracket for'the parts of the electri cation assembl For the purposes of the present disclosure, the invention is shown as embodied in a sewing machine of the portable type. Such a sewlng machine comprises the usual bed 1, from 'which rises the standard 2 of the 0 gooseneck 3 carrying the usual reciprocating needle 4, presser-foot 5 and balance-whee 6. The bed 1 rests upon the wooden base- 7 i v section 7 of the carrying case, including the the motor-shaft 21 to whic The motor comprises the usual laminated field-frame 18 clamped between the endbonnets 19 having bearin s 20, Fig. 5, for

is fixed the beltpulley 22 connected b the belt 23' to the balance wheel 6. The eld-frame is flattened at opposite sides 24, 24 and is rmanently situated in the space between t e standard 2 and the rear wall of the housing or cover 8. I V

The end-bonnets 19 are formed with seats 25 and upstanding flanges 26, 27 upon which seats and between which flanges is fixed the controller 28 in the form of a compression rheostat havin substantially the constructive features 0 the rheostat disclosed in the U. S. atent to Chason, No. 1,643,292, of Septem er 27, 1927. Such a rheostat comprisesa .procelain body formed with a air of wells filled with stacks of carbon are the terminal members 30, 31. The terminal members 30 are connected to metal strips 32 carrying the terminal binding screws 33. The terminal members 31 are connected and have a variable pressure exerted thereon by the weak bow-spring bridging contact-member 34 backed by the somewhat stifier s ring 35, both carried by the'endwise mova le rod 36 parallel to the motor-shaft 21 and surrounded by the relatively'stron recoveryspring 37. Fixed to the inner en of the rod 36 is a guide-head 38 working in a slot 39 in the porcelain body 28. At the inner extreme of the motion of the rod 36,the ide-head presses the rheostat short-circmting sprin 40, secured to one of the terminals 30, into engagement with the contact-plate 41 secured to the other terminal 30. The push-button 42 mounted in the flange 19 in axial alinement and contact with the rod 36 is adapted to move the latter in opposition to the spring The rheostat and motor are connected in series relation to the two-pin terminal plug 43 mounted on the bracket 14 and adapted to receive a mating plug-member connected to the current-supply cord (not shown). Journaled in the forwardly extendin arm 4401? the bracket 13 is a rock-sha t 45 to which is fixed the upstanding arm 46 having at its up r end the rearward extension 47 para eling. the flange 26 and 'sks 29 at the ends of which stacks transverse to the motor-shaft 21 and engaging the pushbutton 42 which lies and moves parallel to the motor-shaft 21.

The rock-shaft 45 supports the manually operated knee-lever 48 which is detachablyconnected to the rock-shaft 45 by a form of bayonet joint including the socket element 49 formed with a'tooth 50' ads. ted to be slipped onto the end of the rock-s aft 45 stantially in accordance withthe disc osure,

of U. S. patent to Hemleb, No. 1,520,949, of December 30, 1924. It will be noted that the push-button 42in the new position of adjustment is not carried out of engagement with the arm 47.

The disposition of the rheostat on the motor frame frees the cavity 57 in the 'inclined arm to a position where the screwwooden base which formerly housed it, for

its originally intended use as a receptacle for the usual sewing machine attachments.

The cavity 57 is closed by a removable cover While the invention is disclosed as embodied in a sewing machine of the portable type havin a flat motor, it is to be understood that t e invention is not limited to any particular type of sewing machine, nor is 1t limited, except as defined in certain of the claims, to the use of a flat motor.

Ill

Having thus set forth the nature of the invention, what I claim herein is:

1. A bracket, motor and motor-controller elements mounted on said bracket, a rockshaft carried by said bracketindependently of said motor and motor-controller elements and connected to o era'te' said motor-0on rearwardly extending arm of said. bracket,

a rock-shaft journaled in the forwardly extending arm of said bracket and connected to operate said motor-controller, and manually controlled means for operating said rock-shaft.

3. The combination with a bracket, of a combined electric motor and motor-controller unit mounted on said bracket, means permitting adjustment of said unit relative to said bracket in a direction transverse to the motor-shaft, said motor-controller having an operating push-button parallel to the motor-shaft, and a manually operated lever-arm mounted on said bracket and including a portion disposed in a plane transverse to the motor-shaft and adapted to engage said push-button in different positions of ad'ustment of said unit.

4. he combination with an electric motor having a frame and shaft, of a rheostat mounted on said motor-frame and including an endwise movable resistance controlling rod dis osed substantially parallel to the a manually controlled rock-shaft journaled in said bracket transversely of the motor shaft, and an arm carried b and adapted to engage sai resistance controlling rod. Y

5. In an electric driving device for sewing machines, electric motor mounted on said bracket and having a shaft, a motor-controller mounted on top of said motor-,and a rock-shaft 'ournaled in said bracket transversely o the motor-shaft and connected to operate said controller.

6. A sewing machine driving device comprising a motor havin a pair of end-bonnets, a laminated fiel -frame clamped between said end-bonnets, an armature having a shaft journaled in said end-bonnets, said end-bonnets being each formed with a controller seat, and a motor-controller secured to said seats and bridging the space between said end-bonnets.

7. A sewing machine driving device comprising a motor havin a pair of end-bonnets, a laminated fiel -frame clamped between said end-bonnets, an armature havin a shaft journaled in said end-bonnets, sai end-bonnets being each formed with a controller seat and an end-flange extending beyond said seat, and a motor-controller securedto said seats and disposed between said end-flanges.

8. A. sewing machine driving device comprising a motor havin a pair of end-bonnets, a laminated fiel -frame clamped between said end-bonnets, an armature havin a shaft journaled in said end-bonnets, said end-bonnets being each formed with a controller seat and an end-flange extending beyond said seat, and a motor-controllersecured to said seats and dlsposed between in combination, a bracket, an

said end-flanges, said motor-controller including an endwise movable operating rod disposed substantially parallel to the motorahaft and passing through one of said end- JAMES M. NAUL.

' motoraft, a bracket carrying said motor,

said rock-shaft whereof, I have signed my 

